Corbin Russwin CK4357 Storeroo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,225.87
$735.28
Corbin Russwin Corbin Russwin CK4357 Storeroom/Closet Cylindrical Lock - Grade 1, Global Knob, Keyed COR-CK4357-KEYED

Corbin Russwin CK4357 Storeroom/Closet Cylindrical Lock - Grade 1, Global Knob, Keyed

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Model: CK4357 GRD 630
$1,225.87
$735.28
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  • Corbin Russwin ADDER-CORBIN RUSSWIN-[KEYING]=KD - Keyed Different ADDER-CORBIN RUSSWIN-[KEYING]=KD - Keyed Different
  • Corbin Russwin ADDER-CORBIN RUSSWIN-[KEYING]=KA - Keyed Alike ADDER-CORBIN RUSSWIN-[KEYING]=KA - Keyed Alike

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,225.87
$735.28
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Corbin Russwin CK4357-KEYED Storeroom/Closet Cylindrical Knobset - Grade 1, Global Knob, Keyed, 1-3/8" to 2" Door Thickness

Commercial-Grade Storeroom Security with Deadlocking Latchbolt Technology

The Corbin Russwin CK4357-KEYED Storeroom/Closet Cylindrical Knobset is a Grade 1 commercial bored lockset engineered for demanding, high-use applications in commercial, industrial, and institutional environments. Featuring a deadlocking latchbolt operated by key in the outside knob or by rotating the inside knob, this lock keeps the outside knob always rigid while the inside knob remains always free, providing reliable storeroom-function security. Compatible with door thicknesses from 1-3/8" to 2" and a standard 2-3/4" backset, the CK4357 is part of the CK4300 Series, which is built with heavy wrought knobs lined with steel for impact resistance and internal parts that are zinc dichromate plated for corrosion resistance.

Professional Features & Benefits

  • Door Thickness Compatibility: Designed for doors ranging from 1-3/8" to 2" thick, accommodating a wide variety of commercial door configurations.
  • Standard Backset: 2-3/4" backset provides a universally compatible fit for standard commercial door preparations.
  • Storeroom/Closet Lock Function: Deadlocking latchbolt is retracted by key in the outside knob or by rotating the inside knob; outside knob is always rigid and inside knob is always free for controlled access security.
  • Heavy-Duty Construction: Heavy wrought knobs with steel liner deliver superior impact resistance, while zinc dichromate plated internal parts provide long-term corrosion resistance for extended service life.
  • Robust Latchbolt: Features a 1/2" (13mm) stainless steel throw deadlocking latchbolt for reliable, secure latching in high-traffic commercial environments.
  • Conventional 6-Pin Cylinder: Includes a conventional 6-pin cylinder and two nickel silver keys for enhanced key security and compatibility with standard keying systems.
  • ANSI Curved Lip Strike Included: Ships with an ANSI curved lip strike measuring 4-7/8" x 1-1/4" x 1-1/4" lip to center for a complete, ready-to-install solution.
  • Non-Handed Design: Non-handed configuration simplifies installation and reduces inventory requirements across mixed-handing door applications.
  • Manufacturer Warranty: Backed by a 3-year warranty for added confidence and protection in commercial installations.

Technical Specifications

  • Subcategory: Cylindrical Locks
  • Product Group: Mechanical Locks
  • Series: CK4300 Series
  • Grade: Grade 1
  • Keyed Function: Single Cylinder
  • Lock Function Description: Deadlocking latchbolt by key in outside knob or by rotating inside knob. Outside knob always rigid.
  • Standard Latch: 787F66 - Deadlocking 2-3/4" Backset, Square corner front, 2-1/4" x 1-1/8" universal
  • Standard Strike: ANSI Curved Lip 4-7/8" x 1-1/4" x 1-1/4" lip to center
  • Warranty: 3 Year
  • ANSI/BHMA: F86
  • Product Subgroup: Bored Locksets
  • Product Type: Knobsets
  • Keyed: Yes
  • Fasteners: Wood and Machine Screws
  • Commercial/Residential: Commercial
  • Lock Type: Cylindrical
  • Handle Type: Knob
  • Lock Function: Storeroom/Closet
  • Product Attribute: Cylindrical Locks
  • Product Model: CK4357
  • Product Function: Storeroom
  • Door Hand Direction: Non-Handed
  • Door Thickness Range: 1-3/8" to 2"
  • Product Category: Mechanical Locks
  • Backset (Distance): 2-3/4"
  • Department: Door Hardware

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness (1-3/8" to 2"), backset (2-3/4"), stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install the standard latch (787F66 - Deadlocking 2-3/4" Backset, Square corner front, 2-1/4" x 1-1/8" universal) and secure the ANSI curved lip strike (4-7/8" x 1-1/4" x 1-1/4" lip to center) to the door frame using the provided wood and machine screws.
  5. Mount the cylindrical knobset assembly to the door per manufacturer torque specifications, ensuring proper alignment of the outside and inside knob components.
  6. Test lock operation: verify the outside knob is rigid, the inside knob rotates freely to retract the latchbolt, and the key in the outside knob properly retracts the deadlocking latchbolt. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Schools and Educational Facilities
  • Hotels and Hospitality Properties
  • Apartments and Multi-Tenant Residential Buildings
  • Hospitals and Nursing Homes
  • Municipal Buildings and Government Facilities
  • Airports and Transportation Hubs
  • Retail Complexes, Offices, and Warehouses

Why Choose Corbin Russwin Quality?

Corbin Russwin CK4300 Series cylindrical locksets are built to Grade 1 commercial standards, featuring heavy wrought knobs with steel liners for impact resistance, zinc dichromate plated internal components for corrosion resistance, and a 1/2" (13mm) stainless steel throw deadlocking latchbolt for dependable security. Each unit is backed by a 3-year manufacturer warranty and meets ANSI/BHMA F86 standards, making it a trusted choice for demanding commercial, industrial, and institutional applications where long-term reliability is essential.

Product Specs

Subcategory:
Cylindrical Locks
Product Group:
Mechanical Locks
Series:
CK4300 Series
Grade:
Grade 1
Keyed Function:
Single Cylinder
Lock Function Description:
Deadlocking latchbolt by key in outside knob or by rotating inside knob. Outside knob always rigid.
Standard Latch:
787F66 - Deadlocking 2-3/4" Backset, Square corner front, 2-1/4" x 1-1/8" universal
Standard Strike:
ANSI Curved Lip 4-7/8" x 1-1/4" x 1-1/4" lip to center
Warranty:
3 Year
ANSI/BHMA:
F86
Product Subgroup:
Bored Locksets
Product Type:
Knobsets
Keyed:
Yes
Fasteners:
Wood and Machine Screws
Commercial/Residential:
Commercial
Lock Type:
Cylindrical
Handle Type:
Knob
Lock Function:
Storeroom/Closet
Product Attribute:
Cylindrical Locks
Product Model:
CK4357
Product Function:
Storeroom
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/8" to 2"
Product Category:
Mechanical Locks
Backset (Distance):
2-3/4"
Department:
Door Hardware

Corbin Russwin CK4357 GRD 630 – Frequently Asked Questions

1) Will the Corbin Russwin CK4357 storeroom knob work on a 2 inch thick door?
Yes. The CK4357 covers doors from 1-3/8 inches up to 2 inches thick, which is wider than most cylindrical knobsets and lets it go onto thicker institutional doors as well as standard 1-3/4 inch commercial leaves. Backset is 2-3/4 inches, the usual commercial bore spacing.
2) What does storeroom function actually do on a knob lock?
The outside knob on the CK4357 is always rigid, so it never turns. Entry from outside is by key only, and the key retracts the deadlocking latchbolt. The inside knob is always free, so anyone inside can get out without a key. The door relocks itself the moment it closes, which is why this is the function used on mechanical rooms, stock rooms, and janitor closets where you never want the door accidentally left unlocked.
3) Is this Corbin Russwin knob lock rated for high traffic commercial use?
It is a Grade 1 commercial lockset meeting ANSI/BHMA F86, which is the storeroom function designation. Grade 1 is the top of the three ANSI/BHMA bored lock grades and the level normally written into school, hospital, and government specs. The catalog lists it as commercial, not residential.
4) Does the CK4357 come with a latch and strike, or do I order those separately?
Both are included. It ships with the 787F66 deadlocking latch, 2-3/4 inch backset, square corner front, 2-1/4 by 1-1/8 inch universal face, plus an ANSI curved lip strike measuring 4-7/8 by 1-1/4 inches with 1-1/4 inch lip to center. Wood and machine screws come in the box too, so the only thing you may still need is a filler plate if the frame prep does not match the ANSI strike cutout.
5) Will the included strike drop into my existing frame prep?
The CK4357 ships with an ANSI curved lip strike, 4-7/8 by 1-1/4 inches, 1-1/4 inch lip to center. If your frames are already cut for the ANSI 4-7/8 inch strike (standard on hollow metal commercial frames), it drops straight in. If the existing opening has a small T-strike or a round corner residential strike, the frame will need to be enlarged or you will need a wrap-around plate. The square corner latch front is 2-1/4 by 1-1/8 inches, which is the standard bored lock latch prep.
6) What is the difference between the standard cylinder version and the LC version of the CK4357?
The standard build comes with a conventional 6-pin cylinder in the L4 keyway and two nickel silver keys, ready to use out of the box. The LC option is less conventional cylinder, meaning it ships without a cylinder so you can install your own to match a facility keyway or an existing master key system. Locksmiths and institutions with their own keying usually take the LC; everyone else takes the standard.
7) Can I get several of these storeroom locks keyed alike so one key opens all of them?
Yes. Keying is a required selection: keyed different is the standard, and keyed alike is available when you want one key to operate multiple locks, which is the usual choice for a maintenance or janitorial key across a building. There is also a free text field for special cylinder or keying requirements if you need them cut to an existing system.
8) I need a Grade 1 knob lock but users should be able to lock and unlock the outside knob themselves. Is the CK4357 right?
No. On the CK4357 the outside knob is permanently rigid and there is no way to leave it unlocked, which is the point of storeroom function. If you want an office or entrance function where the outside knob can be left free, look at the BEST 8K Series entrance function knob lock, which is Grade 1 heavy duty. For a knob that is always free with no key at all, the Schlage D10S passage latch or the Falcon X101 are Grade 1 passage options.
9) What is the closest Grade 1 storeroom knob lock to the Corbin Russwin CK4357 from another manufacturer?
The Sargent 8XG04 is the closest match. It is a Grade 1 heavy duty storeroom/closet single cylinder knob lock with a 2-3/4 inch backset, the same backset the CK4357 uses. Both are keyed single cylinder storeroom function knobsets, so the outside knob stays rigid and is released by key while the inside knob always turns free. If the specification calls for a Grade 1 storeroom cylindrical knobset and Corbin Russwin is not required by the keying system, the 8XG04 covers the same opening.
10) Is there a lighter-duty storeroom knob lock if Grade 1 is more than the door needs?
Yes. The Sargent 6G04 is a standard duty Grade 2 storeroom/closet knob lock with a single cylinder, giving the same storeroom key-in-knob operation at a lower ANSI/BHMA grade. The Corbin Russwin CK4357 is Grade 1 and built for commercial, industrial and institutional traffic with heavy wrought knobs lined with steel. For a low-traffic janitor or utility closet in a light commercial building, the Grade 2 6G04 is the lighter-duty equivalent; for corridor and high-use storage in schools or hospitals, the Grade 1 CK4357 is the heavier build.
11) What is the difference between the Corbin Russwin CK4357 and an entrance function knob lock like the BEST 8K?
Both are Grade 1 knobsets, but the function differs. The CK4357 is storeroom/closet: the outside knob is always rigid and the latch is retracted only by key outside or by turning the inside knob, so the door cannot be left unlocked. The BEST 8K entrance function single cylinder lock allows the outside knob to be unlocked and left in a free state for periods of open access. Choose storeroom where the door must relock every time it closes, entrance where staff need to hold the door unlocked during business hours.
12) Do I have to order the CK4357 knobset left or right handed?
No handing to specify. The CK4357 is non-handed, so one part number covers left and right hand doors in either swing. For a property manager stocking spares, that means a single item on the shelf instead of two.
13) How is this different from the Sargent 8XG04 storeroom knob lock?
Both are Grade 1 heavy duty storeroom function knob locks with a single cylinder, and the Sargent 8XG04 also uses a 2-3/4 inch backset. The practical difference is keying family and trim design: the CK4357 is a Corbin Russwin CK4300 Series knob on the L4 keyway, while the 8XG04 is Sargent 8X Line. Pick whichever matches the key system already in the building. If you want a lighter duty storeroom knob, the Sargent 6G04 is Grade 2 standard duty.
14) Is a 1/2 inch latchbolt throw enough for a commercial storeroom door?
The CK4357 uses a 1/2 inch (13mm) stainless steel throw deadlocking latchbolt, which is the standard throw for a bored cylindrical lock. Deadlocking is the part that matters for security: the auxiliary plunger blocks the latch from being carded or shimmed when the door is closed against the strike. If the opening needs a full 1 inch throw for a code or insurance requirement, that calls for a mortise lock or a deadbolt, not a cylindrical knobset.
15) Can the CK4357 be used on doors that need a lever instead of a knob for ADA?
The CK4357 is a knobset, not a lever. Knobs require grasping and twisting, so where an accessible route requires operable hardware without tight grasping, a lever trim is the answer instead. The CK4357 is a good fit for storage, mechanical, and janitor closets, which are commonly outside the accessible-route requirement, which is also where storeroom function belongs.
16) We need a keyed knob lock on a door thicker than 2 inches - what works there?
The Corbin Russwin CK4357 is rated for doors 1-3/8 inch to 2 inch thick. The Falcon X101 covers 1-3/8 inch to 2-1/4 inch, so it reaches thicker leaves, but note the X101 is a passage function knobset with an interchangeable core prep, not a keyed storeroom lock. If the opening is both over 2 inches and needs key control, confirm the thicker-door kit with the manufacturer rather than substituting a passage function.
17) Can a classroom function knob lock be used in place of the CK4357 on a storage room?
They are not interchangeable. The Dexter C2000 classroom knob lock is a Grade 2 keyed cylindrical knobset in which the key controls whether the outside knob is locked or unlocked. The Corbin Russwin CK4357 is storeroom function, where the outside knob is always rigid and the key only retracts the latch, never leaving the door in an unlocked state. For a supply or storage room that must stay secured, the storeroom function is the correct one; the classroom function is for rooms an instructor locks down and later releases.
18) If the closet door only needs to latch and not lock, what should we order instead of the CK4357?
Use a passage knobset. The Schlage D10S is a Grade 1 heavy duty non-keyed cylindrical passage latch with an orbit knob, and the Falcon W101 is a Grade 2 passage/closet latch with a 2-3/4 inch backset matching the backset the CK4357 uses. Both knobs turn freely from either side with no cylinder. The CK4357 is keyed with a single cylinder, so it is the choice only when the closet must be secured against unauthorized entry.
19) We use interchangeable cores in our facility - is the CK4357 the right pick?
The Corbin Russwin CK4357 is furnished with a conventional 6-pin cylinder in the L4 keyway, and can also be ordered LC, less conventional cylinder, if you are supplying your own. If the facility standard is a small format interchangeable core, the Falcon X101 is a Grade 1 cylindrical knobset built for an interchangeable core, though it is passage function rather than storeroom. Order the CK4357 LC when your keying house is furnishing the cylinder.
20) Is the Imperial ED-BKL580 storeroom knob trim a substitute for the CK4357?
No. The Imperial USA ED-BKL580 is storeroom function knob trim for the ED-500 exit device series, meaning it mounts to an exit device on the outside of the door rather than standing alone. The Corbin Russwin CK4357 is a self-contained cylindrical bored lockset with its own latch and strike. Use the ED-BKL580 only when an ED-500 exit device is already on the opening; use the CK4357 on a standard bored door prep.
21) Is there a keyless option for a storage room so we do not have to issue keys?
The Lockey 3830 is a mechanical keyless combination knob lock with auto-locking passage function, rated for doors 1 3/16 inch to 2 inch, so access is by pushbutton code rather than key. The Corbin Russwin CK4357 is keyed with a conventional 6-pin cylinder and ships with two nickel silver keys, and can be ordered keyed alike across multiple locks. Choose the keyless unit where code changes are easier to manage than key control, and the CK4357 where the room has to join an existing master key system.
22) What finishes does the Corbin Russwin CK4357 knobset come in?
Three: 605 bright brass, 613 satin bronze oil-rubbed, and 630 satin stainless steel. Each is available with either the standard 6-pin L4 cylinder or as LC less cylinder. If you are matching existing commercial openings, 630 satin stainless is the one that lines up with most institutional hardware schedules.
23) Is the CK4357 knob solid enough for a school corridor where it will get kicked and hit?
The CK4300 Series uses heavy wrought knobs lined with steel for impact resistance, and internal parts are zinc dichromate plated against corrosion. Combined with the Grade 1 rating, that is the build level specified for schools, hospitals, airports, and municipal buildings.
24) What do I order for the inactive leaf or a pull-only door where the CK4357 does not apply?
Use a dummy trim knob. The Schlage A170 is a Grade 2 single dummy trim non-keyed knob for doors 1-3/8 to 1-7/8 inch, and the BEST 6K single dummy trim is a Grade 2 medium duty non-keyed knob. Neither has a latch or cylinder - the knob is fixed for pull only. The Corbin Russwin CK4357 is a keyed storeroom lock with a deadlocking latchbolt and is the wrong part for an inactive leaf.
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Corbin Russwin CK4357 GRD 630 come with a warranty?
Absolutely. The Corbin Russwin CK4357 GRD 630 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Corbin Russwin CK4357 GRD 630?
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